well as u shift from one technology to another.. mean the µ --tyechnology scaling factor.. wot u have to keep in mind is the fact that the size of the components also decrease.. various factors like area, which corresponds to lenth and breath.. followed by placement and routin.. delay etc play a very imporant role.. ur design shudnt be a inferior design when u migrate to a smaller sized die.. but almost all of these constraints have to be meet. power is also an important issue that has to be addressed.
with regards,